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Add tcp_freecb() - single place to free tcpcb.
Until this change there were two places where we would free tcpcb - tcp_discardcb() in case if all timers are drained and tcp_timer_discard() otherwise. They were pretty much copy-n-paste, except that in the default case we would run tcp_hc_update(). Merge this into single function tcp_freecb() and move new short version of tcp_timer_discard() to tcp_timer.c and make it static. Reviewed by: rrs, hselasky Differential revision: https://reviews.freebsd.org/D32965
This commit is contained in:
Gleb Smirnoff
parent
fb8588d2cb
commit
ff94500855
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@ -2392,11 +2392,6 @@ void
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tcp_discardcb(struct tcpcb *tp)
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{
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struct inpcb *inp = tp->t_inpcb;
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struct socket *so = inp->inp_socket;
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#ifdef INET6
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int isipv6 = (inp->inp_vflag & INP_IPV6) != 0;
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#endif /* INET6 */
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int released __unused;
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INP_WLOCK_ASSERT(inp);
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@ -2458,121 +2453,100 @@ tcp_discardcb(struct tcpcb *tp)
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CC_ALGO(tp) = NULL;
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inp->inp_ppcb = NULL;
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if (tp->t_timers->tt_draincnt == 0) {
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/* We own the last reference on tcpcb, let's free it. */
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#ifdef TCP_BLACKBOX
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tcp_log_tcpcbfini(tp);
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#endif
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TCPSTATES_DEC(tp->t_state);
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if (tp->t_fb->tfb_tcp_fb_fini)
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(*tp->t_fb->tfb_tcp_fb_fini)(tp, 1);
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bool released __diagused;
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/*
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* If we got enough samples through the srtt filter,
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* save the rtt and rttvar in the routing entry.
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* 'Enough' is arbitrarily defined as 4 rtt samples.
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* 4 samples is enough for the srtt filter to converge
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* to within enough % of the correct value; fewer samples
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* and we could save a bogus rtt. The danger is not high
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* as tcp quickly recovers from everything.
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* XXX: Works very well but needs some more statistics!
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*
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* XXXRRS: Updating must be after the stack fini() since
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* that may be converting some internal representation of
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* say srtt etc into the general one used by other stacks.
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* Lets also at least protect against the so being NULL
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* as RW stated below.
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*/
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if ((tp->t_rttupdated >= 4) && (so != NULL)) {
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struct hc_metrics_lite metrics;
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uint32_t ssthresh;
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bzero(&metrics, sizeof(metrics));
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/*
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* Update the ssthresh always when the conditions below
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* are satisfied. This gives us better new start value
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* for the congestion avoidance for new connections.
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* ssthresh is only set if packet loss occurred on a session.
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*
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* XXXRW: 'so' may be NULL here, and/or socket buffer may be
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* being torn down. Ideally this code would not use 'so'.
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*/
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ssthresh = tp->snd_ssthresh;
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if (ssthresh != 0 && ssthresh < so->so_snd.sb_hiwat / 2) {
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/*
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* convert the limit from user data bytes to
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* packets then to packet data bytes.
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*/
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ssthresh = (ssthresh + tp->t_maxseg / 2) / tp->t_maxseg;
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if (ssthresh < 2)
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ssthresh = 2;
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ssthresh *= (tp->t_maxseg +
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#ifdef INET6
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(isipv6 ? sizeof (struct ip6_hdr) +
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sizeof (struct tcphdr) :
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#endif
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sizeof (struct tcpiphdr)
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#ifdef INET6
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)
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#endif
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);
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} else
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ssthresh = 0;
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metrics.rmx_ssthresh = ssthresh;
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metrics.rmx_rtt = tp->t_srtt;
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metrics.rmx_rttvar = tp->t_rttvar;
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metrics.rmx_cwnd = tp->snd_cwnd;
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metrics.rmx_sendpipe = 0;
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metrics.rmx_recvpipe = 0;
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tcp_hc_update(&inp->inp_inc, &metrics);
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}
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refcount_release(&tp->t_fb->tfb_refcnt);
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tp->t_inpcb = NULL;
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uma_zfree(V_tcpcb_zone, tp);
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released = in_pcbrele_wlocked(inp);
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released = tcp_freecb(tp);
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KASSERT(!released, ("%s: inp %p should not have been released "
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"here", __func__, inp));
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"here", __func__, inp));
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}
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}
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void
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tcp_timer_discard(void *ptp)
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bool
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tcp_freecb(struct tcpcb *tp)
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{
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struct inpcb *inp;
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struct tcpcb *tp;
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struct epoch_tracker et;
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tp = (struct tcpcb *)ptp;
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CURVNET_SET(tp->t_vnet);
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NET_EPOCH_ENTER(et);
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inp = tp->t_inpcb;
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KASSERT(inp != NULL, ("%s: tp %p tp->t_inpcb == NULL",
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__func__, tp));
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INP_WLOCK(inp);
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KASSERT((tp->t_timers->tt_flags & TT_STOPPED) != 0,
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("%s: tcpcb has to be stopped here", __func__));
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tp->t_timers->tt_draincnt--;
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if (tp->t_timers->tt_draincnt == 0) {
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/* We own the last reference on this tcpcb, let's free it. */
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#ifdef TCP_BLACKBOX
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tcp_log_tcpcbfini(tp);
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struct inpcb *inp = tp->t_inpcb;
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struct socket *so = inp->inp_socket;
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#ifdef INET6
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bool isipv6 = (inp->inp_vflag & INP_IPV6) != 0;
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#endif
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TCPSTATES_DEC(tp->t_state);
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if (tp->t_fb->tfb_tcp_fb_fini)
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(*tp->t_fb->tfb_tcp_fb_fini)(tp, 1);
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refcount_release(&tp->t_fb->tfb_refcnt);
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tp->t_inpcb = NULL;
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uma_zfree(V_tcpcb_zone, tp);
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if (in_pcbrele_wlocked(inp)) {
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NET_EPOCH_EXIT(et);
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CURVNET_RESTORE();
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return;
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}
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INP_WLOCK_ASSERT(inp);
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MPASS(tp->t_timers->tt_draincnt == 0);
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/* We own the last reference on tcpcb, let's free it. */
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#ifdef TCP_BLACKBOX
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tcp_log_tcpcbfini(tp);
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#endif
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TCPSTATES_DEC(tp->t_state);
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if (tp->t_fb->tfb_tcp_fb_fini)
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(*tp->t_fb->tfb_tcp_fb_fini)(tp, 1);
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/*
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* If we got enough samples through the srtt filter,
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* save the rtt and rttvar in the routing entry.
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* 'Enough' is arbitrarily defined as 4 rtt samples.
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* 4 samples is enough for the srtt filter to converge
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* to within enough % of the correct value; fewer samples
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* and we could save a bogus rtt. The danger is not high
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* as tcp quickly recovers from everything.
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* XXX: Works very well but needs some more statistics!
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*
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* XXXRRS: Updating must be after the stack fini() since
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* that may be converting some internal representation of
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* say srtt etc into the general one used by other stacks.
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* Lets also at least protect against the so being NULL
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* as RW stated below.
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*/
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if ((tp->t_rttupdated >= 4) && (so != NULL)) {
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struct hc_metrics_lite metrics;
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uint32_t ssthresh;
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bzero(&metrics, sizeof(metrics));
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/*
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* Update the ssthresh always when the conditions below
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* are satisfied. This gives us better new start value
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* for the congestion avoidance for new connections.
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* ssthresh is only set if packet loss occurred on a session.
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*
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* XXXRW: 'so' may be NULL here, and/or socket buffer may be
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* being torn down. Ideally this code would not use 'so'.
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*/
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ssthresh = tp->snd_ssthresh;
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if (ssthresh != 0 && ssthresh < so->so_snd.sb_hiwat / 2) {
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/*
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* convert the limit from user data bytes to
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* packets then to packet data bytes.
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*/
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ssthresh = (ssthresh + tp->t_maxseg / 2) / tp->t_maxseg;
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if (ssthresh < 2)
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ssthresh = 2;
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ssthresh *= (tp->t_maxseg +
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#ifdef INET6
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(isipv6 ? sizeof (struct ip6_hdr) +
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sizeof (struct tcphdr) :
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#endif
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sizeof (struct tcpiphdr)
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#ifdef INET6
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)
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#endif
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);
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} else
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ssthresh = 0;
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metrics.rmx_ssthresh = ssthresh;
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metrics.rmx_rtt = tp->t_srtt;
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metrics.rmx_rttvar = tp->t_rttvar;
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metrics.rmx_cwnd = tp->snd_cwnd;
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metrics.rmx_sendpipe = 0;
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metrics.rmx_recvpipe = 0;
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tcp_hc_update(&inp->inp_inc, &metrics);
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}
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INP_WUNLOCK(inp);
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NET_EPOCH_EXIT(et);
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CURVNET_RESTORE();
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refcount_release(&tp->t_fb->tfb_refcnt);
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uma_zfree(V_tcpcb_zone, tp);
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return (in_pcbrele_wlocked(inp));
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}
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/*
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@ -1042,6 +1042,29 @@ tcp_timers_unsuspend(struct tcpcb *tp, uint32_t timer_type)
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}
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}
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static void
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tcp_timer_discard(void *ptp)
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{
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struct inpcb *inp;
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struct tcpcb *tp;
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struct epoch_tracker et;
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tp = (struct tcpcb *)ptp;
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CURVNET_SET(tp->t_vnet);
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NET_EPOCH_ENTER(et);
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inp = tp->t_inpcb;
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KASSERT(inp != NULL, ("%s: tp %p tp->t_inpcb == NULL",
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__func__, tp));
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INP_WLOCK(inp);
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KASSERT((tp->t_timers->tt_flags & TT_STOPPED) != 0,
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("%s: tcpcb has to be stopped here", __func__));
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if (--tp->t_timers->tt_draincnt > 0 ||
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tcp_freecb(tp) == false)
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INP_WUNLOCK(inp);
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NET_EPOCH_EXIT(et);
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CURVNET_RESTORE();
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}
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void
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tcp_timer_stop(struct tcpcb *tp, uint32_t timer_type)
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{
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@ -217,7 +217,6 @@ void tcp_inpinfo_lock_del(struct inpcb *inp, struct tcpcb *tp);
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void tcp_timer_init(void);
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void tcp_timer_2msl(void *xtp);
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void tcp_timer_discard(void *);
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struct tcptw *
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tcp_tw_2msl_scan(int reuse); /* XXX temporary? */
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void tcp_timer_keep(void *xtp);
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@ -967,6 +967,7 @@ int tcp_ccalgounload(struct cc_algo *unload_algo);
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struct tcpcb *
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tcp_close(struct tcpcb *);
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void tcp_discardcb(struct tcpcb *);
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bool tcp_freecb(struct tcpcb *);
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void tcp_twstart(struct tcpcb *);
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void tcp_twclose(struct tcptw *, int);
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void tcp_ctlinput(int, struct sockaddr *, void *);
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